Explosive-engine cylinder.



PATENTED APR, 80, 1907.

J, W. BIGSBY & F. W. BARHGFF.

EXPLOSIVB ENGINE CYLINDER.

APPLIOATION FILED MAR. 9.1908

JESSE .IW. BIGSBY AND FRED W. BARHOFF, or HARTFORD, CONNECTICUT.

EXPLOSlVE -ENGI Nl-E CYLINDER.

. f No.851,977.

United States, residing at Hartford, in the To all whom it mayconcern/.-

' Be it known that we, Jnssn W. BIosBY and FRED W. BARHQFF, cltlzens ofthe county of Hartford and State of Connecticut, have invented a new anduseful Explosive- Engine Cylinder, of which the following 18 aspecification.

This invention relates to a cylinder for an explosive engine which isprovided with a large number ofpla'tes arranged to effect a rapidradiation-of heat from the cylinder to the atmosphere.

The object of the invention is to produce a cylinder of this naturewhich is cheap to ;manuiacture and eflicient in use. 4 This cylinder hasa cast metal body and plates extending longitudinally from the outersurface of the body, said plates-having their outer edges substantiallyequi-distant from .each other and their inner edges grouped together andtightly held in undercut recesses in the body, as more particularlyhereinafter described.

Figure 1 of the accompanying drawings is 'a longitudinal section of acylinder that embodies the invention. Fig. 2 is a transverse section .ofthis cylinder. Fig. 3 is a short sec tion on lar er scale of thecylinder showing an unoccupied under-cut recess, a pair of plates aboutto bedriven intb the unoccupied re- "cessja pair of plates driveninto-such a recess, and a pair of plates driven in and opened, as whenfinished. Fig. 4 is a similar yiew showing a larger number of plates inFig. 5 1s a similar view showing each recess.

Flg. 6 1s a similar.

a different form of recess.

view showinga still different form of recess and another way offastening the plates clined grooves 3.

therein; Fig. 7 shows a different way of fastening the plates. Fig.8shows another way, and Fi 9 shows still another way.

.The 'ody 1 of the cylinder is cast to shape of iron or steel andfinished as usual. When the body is cast undercut recesses are maybestamped from iron, steel, copper or any other metal having suitable heatconduc tivity.

In the form first illustrated the under-cut recesses are made in theshape of two in- Into these grooves the inner edges of the plates 4 aredriven. There may be two of these plates, as shown in Fig.

the edges Patented April 30, 1907.

3", or more, as shown in Fig. 4. The plates are fastened togetherflat-wise by brazing or by rivets, as desired, and the inner edges areslightly separated "so that when the plates are driven into the recessesthe edges will be wedged apart into the under-cuts. After Instead ofmaking the recesses in the shape of two inclined rooves, as shown inFig. 3, they maybe made with small wedges 5 at the bottom, as shown inFig. 5. In this case the wedges spread the lower edges of the platesinto the under cuts so that they' will a be tightly 'held in position.

The recesses may be made in the shape of plain dove-tails 6, as showninFig'. 6. In this case a small wedge 7 may be started in between theplates before they are driven into the dove-tails. These wedges spreadthe lower edges of the plates when-they are driven into the recesses.

Instead of using an independent wedge, as shown in Fig. 6, a trough of'sheet metal 8 may be bent around the inner edges of the plates andafter the plates and the trough have been placed in the under-cutrecesses, the'edgcs of the trough may be forced inwardly by hydraulicpressure and expanded so as to bind the plates and hold them in therecesses, as shown in Fig. 7.

If desired, the plates 9 with their inner edges spread apart, may beplaced in the sand in the mold and the body of the cylinder cast aboutthe spread inner edges, as shown in Fig' 8. In this case there isintimate contact between the faces of the spread inner edges and thewallsof the under-cut recesses in thcbody which they occupy.

The plates can bev doubled and formed with triangular heads 10 at thebends, as shown in Fig. 9. Plates doubled in this way can be put intothe mold and the body of the cylinder cast about them so that theycannot be withdrawn afterthe body has hardened. These plates may beseparated so that the air spaces between their outer edges will bepractically uniform.

In all of the forms shown the mold is easily made so that the cylindercan be cast with a wall of uniform thickness, and the under-cut recessescan'bc conveniently formed either by providing for them when thecylinder is cast or by machining them after the cylinder is cast. Theseplates are easily laced in the recesses and they will not wor looseafter ave been driven inthe outer portions of the plates may beseparated.

they have once been secured therein. The inner edges of these platesmake intimate junction With the body of the cylinder and as there .aremany of them a large quantity of heat is conducted from the body of thecylinder and radiated into the atmosphere.

The invention claimed is 1. An explosive engine cylinder having a castmetal body with under-cut grooves extending longitudinally in the outersurface of the body and metal plates located in groups with the platesof each group separated at their outer ed es but secured together neartheir inner e ges and having their inner edges occupying the under-cutgrooves, substantially as specified. v

2. An explosive engine cylinder having a cast metal body with under-cutgrooves, ex

tending longitudinally in the outer surface of the body and metal plateslocated in groups with the plates of each group scpavrated at theirouter edges but secured to' gether near their inner edges and hayingtheir inner edges spread apart and occupying the under-cut grooves,substantially as specified. .3. An explosive engine cylinder having asenew groups with the plates of each group separated at their outeredges but secured together near their inneredges and having their inneredges separated by Wedge-like portions of metal and occupying theunder-cut grooves, substantially as specified.

'4. An explosive engine cylinder having a cast metal body with a largenumber of grooves extending longitudinally in the outer surface of thebody, the Walls of the adjacent grooves inclining oppositely Withrelation to each other, and metal plates located in groups with theplates of eachv group sep arated near their outer edges but securedtogether near their inner edges and having their inner edges separatedand occupying the inclined longitudinal grooves, substantially asspecified.

. JESSE l/V. BIGSBY. I FRED V. BARHOFF.

VVitness'es:

HARRY R. VVILLIAMs, ETHEL M. LOWE.

